CXSD61054 fully in tegrated , high-efficiency 2.0A synchronous rectified step-down converter hi

目录lmZ嘉泰姆

1.产品概述                       2.产品特点lmZ嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 lmZ嘉泰姆
5.产品封装图                     6.电路原理图                   lmZ嘉泰姆
7.功能概述                        8.相关产品lmZ嘉泰姆

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一,产品概述(General Description)      lmZ嘉泰姆

     The CXSD61054 is a fully in tegrated , high-efficiency  2.0A  synchronous  rectified step-down  converter.  The CXSD61054 operates at high efficiencylmZ嘉泰姆
over a wide output current load range.lmZ嘉泰姆

      This device offers two operation modes,PWM control and PFM ModelmZ嘉泰姆
switching control, which allows a high efficiency over the wider range of thelmZ嘉泰姆
load.The  rber of readily available standard external components and islmZ嘉泰姆
available in an 6-pin SOT23 ROHS compliant package.lmZ嘉泰姆

二.产品特点(Features)lmZ嘉泰姆

* High Efficiency: Up to 95%lmZ嘉泰姆
* 600KHz Frequency OperationlmZ嘉泰姆
* 2.0A Output CurrentlmZ嘉泰姆
* No Schottky Diode RequiredlmZ嘉泰姆
* 3.5V to 18V Input Voltage RangelmZ嘉泰姆
* 0.6V ReferencelmZ嘉泰姆
 Slope Compensated Current ModelmZ嘉泰姆
 Control for Excellent Line and LoadlmZ嘉泰姆
 Transient ResponselmZ嘉泰姆
* Integrated internal compensationlmZ嘉泰姆
* Stable with Low ESR Ceramic OutputlmZ嘉泰姆
   CapacitorslmZ嘉泰姆
* Over Current Protection withlmZ嘉泰姆
    Hiccup-ModelmZ嘉泰姆
* Input over voltage protection(OVP)lmZ嘉泰姆
*  Thermal ShutdownlmZ嘉泰姆
*  Inrush Current Limit and Soft StartlmZ嘉泰姆
*  Available in SOT23-6 PackagelmZ嘉泰姆
*  -40°C to +85°C Temperature RangelmZ嘉泰姆
三,应用范围 (Applications)lmZ嘉泰姆

Distributed Power SystemslmZ嘉泰姆
Digital Set Top BoxeslmZ嘉泰姆
Flat Panel Television and MonitorslmZ嘉泰姆
Wireless and DSL ModemslmZ嘉泰姆
Notebook ComputerlmZ嘉泰姆
四.技术规格书下载（产品PDF）lmZ嘉泰姆

需要详细的PDF规格书请扫一扫微信联系我们，还可以获得免费样品以及技术支持！lmZ嘉泰姆

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五,产品封装图 (Package)lmZ嘉泰姆

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六.电路原理图lmZ嘉泰姆

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七,功能概述lmZ嘉泰姆

Internal Regulator lmZ嘉泰姆
The CXSD61054 is a current mode step down DC/DC converter that provides excellentlmZ嘉泰姆
transient response with no extra external compensation components. This device containslmZ嘉泰姆
an internal, low resistance, high voltage power MOSFET, and operates at a high 600KlmZ嘉泰姆
operating frequency to ensure a compact, high efficiency design with excellent AC and DClmZ嘉泰姆
performance.lmZ嘉泰姆

Error AmplifierlmZ嘉泰姆
The error amplifier compares the FB pin voltage with the internal FB reference (VFB) andlmZ嘉泰姆
outputs a current proportional to the difference between the two. This output current is thenlmZ嘉泰姆
used to charge or discharge the internal compensation network to form the COMP voltage,lmZ嘉泰姆
which is used to control the power MOSFET current. The optimized internal compensationlmZ嘉泰姆
network minimizes the external component counts and simplifies the control loop design. lmZ嘉泰姆
Internal Soft-StartlmZ嘉泰姆
The soft-start is implemented to prevent the converter output voltage from overshootinglmZ嘉泰姆
during startup. When the chip starts, the internal circuitry generates a soft-start voltage (SS)lmZ嘉泰姆
ramping up from 0V to 0.6V. When it is lower than the internal reference (REF), SSlmZ嘉泰姆
overrides REF so the error amplifier uses SS as the reference. When SS is higher thanlmZ嘉泰姆
REF, REF regains control. The SS time is internally fixed to 1 ms.lmZ嘉泰姆
Over-Current-Protection and HiccuplmZ嘉泰姆
The CXSD61054 has cycle-by-cycle over current limit when the inductor current peak valuelmZ嘉泰姆
exceeds the set current limit threshold. Meanwhile, output voltage starts to drop until FB islmZ嘉泰姆
below the Under-Voltage (UV) threshold, typically 30% below the reference. Once a UV islmZ嘉泰姆
triggered, the CXSD61054 enters hiccup mode to periodically restart the part. ThislmZ嘉泰姆
protection mode is especially useful when the output is dead-short to ground. The averagelmZ嘉泰姆
short circuit current is greatly reduced to alleviate the thermal issue and to protect thelmZ嘉泰姆
regulator. The CXSD61054 exits the hiccup mode once the over current condition islmZ嘉泰姆
removed. lmZ嘉泰姆
Startup and Shutdown lmZ嘉泰姆
If both VIN and EN are higher than their appropriate thresholds, the chip starts. ThelmZ嘉泰姆
reference block starts first, generating stable reference voltage and currents, and then thelmZ嘉泰姆
internal regulator is enabled. The regulator provides stable supply for the remaininglmZ嘉泰姆
八,相关芯片选择指南               更多同类产品......lmZ嘉泰姆